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Originally Posted by RyanH
There are very low-power jammers I've found to work perfectly just for this purpose. It creates a small bubble a few meters across that whacks any cell signal including 3G and texting.
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That's very cool. I thought there must be something around like this.
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The best part is the look on the kids faces when they scrunch up at the screen noticing they get no cell connection in just that class.
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Hah... this is even cooler. I know some adults I'd like to try it on!